Synthetic Fibres

Extra Questions

Short Answer Type Questions

Question 1: Write some salient features of rayon.

Answer: Some salient features of rayon are as follows:

Question 2: What are the characteristics of synthetic fibres?

Answer: Following are the characteristics of synthetic fibres:


Question 3: Plastic bags create which kinds of problems?

Answer: Following problems are created by plastic bags:

Question 4: Write a short note on acrylic.

Answer: Acrylic resembles wool and hence is also called synthetic wool. It is cheaper and more durable than wool, and is easier to wash and maintain. Acryclic is less expensive, easily available, easy to wash and is easy to maintain.

Question 5: What is the difference between nylon and rayon?

Answer:

RayonNylon
It was the first synthetic fibre.It was the first truly synthetic fibre.
Rayon is made from wood pulp.Nylon is made from coal, water and air.
Rayon is used for making curtains, bedsheets, etc.Nylon is used for making socks, rope, toothbrush, parachute, etc.

Long Answer Type Questions

Question 1: Explain the discovery and unique features of nylon.

Answer: Nylon was made in 1931. The term ‘nylon’ has been derived from letters of ‘New York’ and ‘London’. No ingredient from plant or animal source was used in making nylon, as it is made from coal, water and air. Hence, nylon is called the first truly synthetic fibre.

Question 2: Explain different types of plastic and their usages.

Answer: Different types of plastic and their usages are as follows:

  1. Thermoplastic: Some plastics easily get deformed on heating, and can be easily bent and reshaped by heating. They are called thermoplastic. Polythene and PVC are examples of thermoplastic. Thermoplastic is used for making combs, toys, buckets, mugs, etc.
  2. Thermosetting Plastic: Some plastics do not get deformed on heating, and cannot be re-molded into a new shape. Such plastics are called thermosetting plastic. Bakelite and melamine are examples of thermosetting plastic. Bakelite is used for making electrical switches and switchboards because it is a poor conductor of heat and electricity. Melamine is resistant to fire and is hence used for making utensils.

Question 3: What are the reasons for popularity of plastic?

Answer: Following are the reasons for popularity of plastic:



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